Nature, Uncategorized

Comets in the Night Sky – 33 Pictures

There are tons of comets in our solar system. They usually do not get close to the earth.

The Sun is at the center and is very bright.

In the sky you can view stars, nebula, and galaxies.

A comet is made of ice and rock and has typical size of 10 km in diameter. The largest is 10199 Chariklo at 258 km.

Nasa reports there are 3743 known comets. There is likely billions of them that we do not know about.

Images from NASA:


The next appearance will be in 2061.

The comet’s perihelion (closest approach to the Sun) is only 0.6 AU, and it travels as far from the Sun as beyond the orbit of Neptune. As a result, Halley is not visible from Earth (with naked eyes) when it passes through perihelion.



Comet 103P/Hartley (Hartley 2)

The nucleus of Hartley 2 is estimated to be 3.4 kilometers long, 2.1 kilometers wide and it rotates every 12 hours at the average distance of 2.2 AU from the sun. The coma around its nucleus extends about 20,000 km into space though this could be closer depending on the activity level of the comet’s nucleus. Comet Hartley 2 is moving toward the sun, where it will reach perihelion on November 27, 2010.







Comet ISON







Comet Siding Spring Seen Next to Mars






Oort cloud comet C/2014 Q2, aka Lovejoy



Comet Kohoutek



Six comet-like tails radiating from a body in the asteroid belt, designated P/2013 P5



Comet Siding Spring




Comet Hale-Bopp



Hubble View of ISON



Composite photo,  images of Jupiter and Comet P/Shoemaker-Levy 9



They are fast moving. Example speeds:

Borisov   175,000 km per hour
Neowise   230,000 km an hour
Leonard   254,400 km per hour


The time it takes to travel one orbit is the period, here are examples from NASA data:

Halley  76.1 yrs.
Encke  3.30 yrs.
d’Arrest  6.51 yrs.
Tempel 1  5.51 yrs.
Borrelly  6.86 yrs.
Giacobini-Zinner  6.52 yrs.
Grigg-Skjellerup  5.09 yrs.
Crommelin  27.89 yrs.
Honda-Mrkos-Pajdusakova  5.29 yrs.
Wirtanen  5.46 yrs.
Tempel-Tuttle  32.92 yrs.
Churyumov-Gerasimenko  6.57 yrs.
Schwassmann-Wachmann 3  5.36 yrs.
Kohoutek  6.24 yrs.
West-Kohoutek-Ikemura  6.46 yrs.
Wild 2  6.39 yrs
Chiron  50.7 yrs.
Wilson-Harrington  4.29 yrs.
Hale-Bopp  4000. yrs.
Hyakutake 40000. yrs.


Pictures of comets:



More cool pictures of comets: